manifest.yaml

id: model_deprecated
name: Model Deprecated / Sunset
category: reliability
severity: high
targets: [llm_chat]
tags: [reliability, http, model, deprecation, migration]

description: "the requested model has been sunset and the endpoint returned 410 Gone (permanent removal) instead of serving the request, and the agent didn't migrate to a successor model"
fix_hint: "Detect model deprecation/sunset responses (410 Gone, model_not_found) and migrate to a supported successor model rather than retrying the dead one"

phase: pre
action: return_error
params:
  status: 410